Abstract
uring the last 3 decades, endovascular techniques have evolved rapidly, and upper basilar artery aneurysms that D are closely related to the midbrain and brainstem are treated using endovascular techniques in many institutions. However, high rates of residual lesions and recurrent aneurysm growing are the drawbacks of endovascular treatment (11). The operative approach generally depends on the size, shape, and localization of the intracranial aneurysm, the degree of brain swelling, other patient comorbidities, and microsurgical experience. The exact aneurysm location is particularly important when choosing a surgical approach. In upper basilar artery aneurysm surgery, prevention of injury to brainstem perforators is crucial.
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